Animal Crossing Wild World. Missing visuals (dialogue options/ Map)

Hello,

I have got animal crossing wild world rom and this emulator. It seems to work fine except a couple of issues. Sometimes when I speak to an animal and get dialogue options, the diaologe options do not appear on the screen. I have to just click the screen and then find out from their response what I have clicked. Similarly, when opening the town map, sometimes only the building icons will appear and the map background itself will be missing. Anyone else experienced these issues and know how to fix them? Thank you.